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Disintegration of TEMPO-treated fibers by melt mixing
2009 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

A new method for disintegrating TEMPO-oxidized pulp fibers into cellulose nanofibrils using a single screw extruder has been investigated. A thermoplastic starch matrix has been used as main disintegration environment since the treated fibers were used as fillers. To prove the efficiency of this technique, the extrusion of untreated pulp fibers reinforced TPS matrix has been done. The results obtained are interesting. The extrudates containing treated fibers exhibit higher elastic modulus, tensile strengths than the reference materials. The thermal properties have been observed using Dynamic Mechanical Analysis and Thermogravimetric Analysis, the obtained results showed more improved properties in the case of TEMPO- treated fibers reinforced TPS. The effect of the screw rotation speed (during the production) has been studied and revealed no significant improvement in the properties of the composites containing treated fibers. The moisture sensitivity has also been investigated. The produced specimen containing treated fibers are less sensitive to ambient moisture than the reference materials. SEM images permitted to confirm the presence of nanofibrils in the structure of these composites.

Place, publisher, year, edition, pages
2009.
Keyword [en]
Physics Chemistry Maths, TEMPO-oxidized pulp fibers, disintegration, single screw, extruder, DMA, TGA, SEM, elastic modulus, tensile strength, screw rotation speed, thermoplastic starch matrix
Keyword [sv]
Fysik, Kemi, Matematik
Identifiers
URN: urn:nbn:se:ltu:diva-42718ISRN: LTU-EX--09/124--SELocal ID: 0b1e3fa4-a560-453d-bde5-2efc7750f818OAI: oai:DiVA.org:ltu-42718DiVA: diva2:1015944
Subject / course
Student thesis, at least 30 credits
Educational program
Materials Engineering, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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